Speyer Cathedral, in Germany, designated a World Heritage site in 1981.

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An ancient Celtic settlement, about 100 bce it became a Roman military and trading town, Noviomagus, and later became known as Nemetes after the local inhabitants (Nemetae). It was destroyed about 450 ce during the barbarian invasions. Rebuilt and created a bishopric in the 7th century, it was a free imperial city from 1294 to 1797 and was the seat of the Reichskammergericht (Imperial Chamber of Justice), the Holy Roman Empire’s high court, from 1527 to 1689. Fifty imperial diets (assemblies) were held in Speyer, and at one such diet in 1529, Martin Luther’s followers protested against the majority’s decision to rescind the concessions made to the Lutherans in 1526. The word Protestant originated from this incident. Destroyed by French troops (1689) during the War of the Grand Alliance, Speyer was incorporated into the French Republic in 1797, passed to Bavaria in 1815, and was the capital of the Bavarian (Rhenish) Palatinate from 1816 to 1945.

Speyer is an important regional retail centre, and tourism is a leading industry. The city contains electrotechnical industries and an oil refinery. Manufactures include metal, machinery, ships, aircraft, textiles, and chemicals. The medieval city is surrounded by modern industrial and residential areas. The bridge across the Rhine, destroyed in 1945, was rebuilt (1956). Historic remains in the city include the Altpörtal (“Old Gate”) with a 13th-century gate tower, the subterranean Jewish Baths (early 12th century), and the Baroque Trinity Church (1701–17). The city’s Romanesque cathedral, founded in 1030 by the Holy Roman emperor Conrad II, contains a unique crypt and the tombs of eight German emperors and kings and three empresses. Gutted in 1689 and rebuilt several times, it was consecrated in 1961 after its most recent restoration. In 1981 the cathedral, one of the largest and most important Romanesque structures, was designated a UNESCOWorld Heritage site. Speyer also has a technology museum and a sea-life centre. Pop. (2011) 49,540.

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